The e-mail address of the person represented by the #GDataGDWho.
For more information, see the
Specifies the relationship between the containing entity and the contained person. For example: %GDATA_GD_WHO_EVENT_PERFORMER or %GDATA_GD_WHO_EVENT_ATTENDEE.
For more information, see the
A simple string representation of this person.
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Specifies whether the object was constructed by parsing XML or manually.